Great suggestion. It could be possible over Bluetooth with the Motherboard, but WiFi would be more reliable and probably has a lot more support already. I’ve seen arduinos communicate with Home Assistant on a Pi via USB, so that would be possible out of the box.
I’m planning to release a Motherboard v2/v3 with a drop in esp module with onboard wifi instead of the Atmega chip. That would definitely make things a little easier.
Anyone else with some ideas on making this work?